| They paid 30 all up
but should have paid 25 div by 3 = 8.33 per person
get back 5 so 5-2(bell boy)-1-1-1=0
they have paid 10 each and got back 1, but really they each paid 9.33
8.33+1x3+2=29.99
That is my attempt but I will pass this on to my wife as she is the number crunching guru in our house.
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Some more words of wisdom from LIPS
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